Phenotypic and genetic parameters of three body weight traits and the first greasy fleece weight in Fleisch Merino sheep in Egypt

Abdel Aziz, A.S.; Imam, S.A.; Ragab, M.T.; Sharafeldin, M.A.

Egyptian Journal of Animal Production 18(1): 29-38

1978


Accession: 000948561

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Abstract
Records of birth weight, weight at 4 months and 1 yr of age, and greasy fleece weight for the 1st shearing of 3855 Fleisch Merino [Mutton Merino] lambs on 5 farms, born in 3 successive yr, were studied by least-squares analysis of variance. The h2s of the 4 traits were 0.29 plus or minus 0.058, 0.28 plus or minus 0.057, 0.29 plus or minus 0.058 and 0.32 plus or minus 0.061 resp. All correlations among body weight traits were significant (genetic, 0.20-0.46; phenotypic, 0.23-0.48). Greasy fleece weight had significant genetic correlations with body weight at the 3 ages (0.11, 0.38 and 0.37 resp.), but a significant phenotypic correlation only with weight at 4 months (0.09). Environmental correlations were similar to the corresponding phenotypic correlations. Heritability in 3,855 Fleisch Merino lambs born over three successive years on five Egyptian farms was estimated at 0.29 plus or minus 0.058, 0.28 plus or minus 0.057, 0.29 plus or minus 0.058 and 0.32 plus or minus 0.061 for birth, four-month, yearling body weights and for the first greasy fleece weight, respectively. All phenotypic and genetic correlations between body weight traits were positive and significant. Phenotypic correlations between first greasy fleece weight and each of birth weight, four-month weight and yearling weight were -0.01 plus or minus 0.016, -0.09 plus or minus 0.016, -0.02 plus or minus 0.016, respectively. The second estimate only was significant.